Lawn Care Tools
Seeding Rate Calculator by Grass Type
Find exactly how much grass seed your lawn needs. Enter your area, pick your grass type, and choose whether you're establishing a new lawn or overseeding an existing one.
Overview
The Seeding Rate Calculator by Grass Type tells you how many pounds of grass seed you need for your lawn, based on the single factor most seeding guides get wrong: different grasses have very different seed sizes and spreading habits, so a rate that's perfect for Tall Fescue would waste money on Bermudagrass and starve a Kentucky Bluegrass lawn.
It's built for homeowners seeding a new lawn, landscapers quoting a job, and anyone overseeding thin or patchy turf. Instead of guessing or buying one bag too many, you get a realistic quantity in both pounds and kilograms, plus the recommended range so you can round to the nearest bag with confidence.
How It Works
- Enter your lawn area and pick the matching unit — square feet, square yards, square metres, or acres.
- Select your grass type from the list. Each type carries its own research-based seeding rate.
- Choose the purpose — a new lawn on bare soil uses the full rate, while overseeding an existing lawn uses roughly half.
- Click Calculate. You'll see the total seed required, the rate applied, and the recommended low-to-high range for your situation.
Fields start empty on purpose. If you click Calculate without filling them in, the calculator highlights what's missing so nothing is left to chance.
Formula Explanation
Seeding rates are published per 1,000 square feet. The calculator converts your area to that base unit, multiplies by the rate for your grass type, and applies a purpose factor:
Seed (lb) = (Area in sq ft ÷ 1,000) × Rate × Purpose factor
Where Rate is the typical pounds per 1,000 sq ft for the grass type, and Purpose factor = 1.0 for a new lawn, 0.5 for overseeding. Kilograms are the pound result × 0.4536.
The typical seeding rates used (pounds of seed per 1,000 sq ft for a new lawn):
| Grass type | Typical rate (lb / 1,000 sq ft) |
|---|---|
| Kentucky Bluegrass | 2 – 3 |
| Tall Fescue | 6 – 10 |
| Fine Fescue | 4 – 5 |
| Perennial Ryegrass | 5 – 9 |
| Annual Ryegrass | 5 – 10 |
| Bermudagrass (hulled) | 1 – 2 |
| Zoysiagrass | 1 – 2 |
| Centipedegrass | 0.25 – 0.5 |
| Buffalograss | 2 – 3 |
| Creeping Bentgrass | 0.5 – 1 |
Practical Benefits
- Stop over-buying seed. Grass seed is expensive; matching the rate to your grass type can save a bag or more on an average lawn.
- Avoid a thin or overcrowded lawn. Too little seed leaves bare patches; too much causes seedlings to compete and die off from disease.
- Quote jobs faster. Landscapers can size a seed order in seconds for any lawn and any species.
- Plan overseeding correctly. The half-rate factor reflects how established turf should be topped up, not reseeded from scratch.
